Improved lifting-jack



M. THOMPSON, or cosHocTonb'Hro.

Letters .Patent No. 77,678, dated lieg/5, 1868.

IMPROVBDv LIPTING-JAGK.

alge segnali afa-tait in tipa @man prima mit hitting 'partiti tigt am.

TO ALL WHOM IT MAY CONGERN; i

Be it known that I, R. M. THOMPSON, `oi" -Coshocton, in the county of Coshocton, and State of Oliio,'have invented c, new and improved Lifting-Jack; and I' do hereby declare that the following is a full and exact description ofthe same, reference being had tothe accompanying drawings, and tothe letters of reference marked thereon.

This invention relates to an improved lii'tingjack, the novelty of which c'onsists principally 'in a pivoted andweighted st irr.up-iron, which swings under thelii'ting-bar when the loadis raised, and supports'the weight; also, in oertainother devices. whereby this arrangement is made eilective, as will be fully described hereinafter. In the drawings, A represents a base-block of any suitable size and shape, from which rises thestandard B. `(l represents a lever provided with a slot, e, through which the standard B passes, which is pivoted to the latter at the point x. l v

l) representsaguarddpiece, constructed as' shown, and attached in any proper-manner to the upper part of the standard B, l l

E represents an iron rod,fresting in a socket in the lever C, and pivoted thereto, over which is placed the hollow bor: F.

ee represent notches in the rod E, which correspondiin position with the holefin the box F', so that when the pinf' is inserted inte the h-olef, it restsin one of these notches e e. A By means of this latter arrangement the boxis shifted to any desired-height within'the range of the jack. v i

G represents a stirrpliron pivoted to the lever C, as shown, which is so constructed thatlits lower part is much more weighty than its upper, theve'e'ct of whicharr-angement is that when the'long arm of the `lever C is'depressed, the stirrnp-iron, by its .own weight, assumes a perpendicular position under the end ofthe short arm, and, the pressure being relaxed,` the whole lweight is borne by it.

.g represents one side of the stirrap-iron, which extends above its pivot-point, to which the link g1 is attached, connecting-with which latter is the rod y, terminating in the handle g3. Y

It will be observed .that the under part-of the stirrup-iron, and also the corresponding part of the base, are inclined,- this construction being for the purpose oi"permitting the iron to come readily to place when the lever is depressed.

From this description, the operation-of my jack will be readily understood.

The lifting-bar having been first adjusted, by means ofthe pinf having been placed in the proper `notch of the rodE, the latter having beenl moved up or downto the proper point for this purpose, the jack is placed under the axle or other n iattervto be raised. The long arm of the lever C being depressed, the short arm'is conse. qnently elevated, and with it the lifting-bar- `At the'same time the stirrup-iron, by its own weight, assumes a perpendicular position directlyundcr the lifting-bar, and the lever C being released, all the Weight is borneiby it.

When it is desired to let down the jack, the lever C shonldbe held,'when,' thehandle g3 being pulled, the.

stirrup-iron is thrown up and the load may be then gradually cased down. By this simple arrangementrthe Weight of the load, when the jack is inoperation, rests ina direct line upon the lifting-berend the stirrnp-iron,l

and all the other partsA are relieved entirely from `the strain. A l Having thus fully described my invention, what I claim as new, and desire to secure byIletters Patent, is'- 1. The lever C and 'standard B, in combination with stirrup-iron G, substantially as described. 2. The'basc, standard B, lever` C, guard-piece D,rcd E, box F, and stirrup-iron G, the-whole being combined and arranged substantially as described.

This specification signed and witnessed, this third day of Merch, 1868.

R. M. THOMPSON.

Witnesses: T. W. ConLInR, Jr., F. S. FAULKNER. 

